JP7325801B2 - Exhaust gas purification system - Google Patents

Description

TECHNICAL FIELD The present invention relates to an exhaust gas purification system, and more particularly to a configuration for removing harmful components contained in exhaust gas.

Diesel engines, which are used as power sources for ships, power generators, and large heavy machinery, often use low-quality fuel oil such as heavy fuel oil C, which is available at low cost.
However, this low-quality fuel oil contains particulate matter (PM) mainly composed of particulate matter, sulfur oxides (SOx), nitrogen oxides (NOx), etc. in the exhaust gas generated after combustion. These components are causative substances that cause air pollution and corrosion of equipment, and are also harmful components that exert an adverse effect on the human body.

Nitrogen oxides (NOx), one of the harmful constituents, can be reduced in incidence by exhaust gas recirculation methods that return a portion of the exhaust gas to the engine.
However, the recirculated exhaust gas may contain a large amount of particulate matter (PM) and sulfur oxides (SOx) that may adversely affect air pollution and equipment. Therefore, it is necessary to remove these components from the recirculated exhaust gas.

Conventionally, as a method for removing particulate matter (PM) and sulfur oxides (SOx) contained in exhaust gas, there is known a scrubber device that brings the exhaust gas into contact with a cleaning liquid (for example, Patent Document 1).
Patent Literature 1 discloses a technique for capturing particulate matter and sulfur oxides in the exhaust gas with droplets by bringing the exhaust gas into contact with a cleaning liquid.

Exhaust gases that come into contact with the cleaning liquid in the scrubber device contain a large amount of moisture. This moisture-laden exhaust gas, if recirculated, causes corrosion of the internal combustion engine and must be removed.
Therefore, it is known to remove the moisture in the exhaust gas by cooling the exhaust gas that has passed through the scrubber device and recovering it as a condensed liquid (for example, Patent Document 2).
In addition to these techniques, as a gas-liquid contact method in the scrubber device, there is also known a technique in which the exhaust gas is swirled in the scrubber device and brought into contact with the sprayed cleaning liquid (for example, Patent Document 3).

As disclosed in Patent Document 1, it is necessary to supply a large amount of the cleaning liquid that comes into contact with the exhaust gas in the scrubber device, taking into consideration the amount of the cleaning liquid that does not function as a cleaning liquid due to evaporation or the like.
In particular, ships sometimes use seawater as a cleaning liquid.
When a large amount of seawater is brought into contact with the exhaust gas, the operating cost of the supply system rises in order to cover the large consumption of seawater. A new problem arises that it becomes easier.

Therefore, Patent Document 2 proposes a method of temporarily recovering the condensate obtained by cooling and reusing the recovered condensate as a cleaning liquid.
However, since the recovered condensate contains sulfur oxides (SOx) in the exhaust gas, the pH value of the collected condensate drops and becomes acidic. For this reason, if the condensate with a low pH value is reused as a cleaning liquid, the desulfurization reaction cannot be performed well, and as a result, there is a risk that the SOx removal efficiency will decrease. In order to prevent the SOx removal efficiency from decreasing, a process for controlling the pH value of the collected condensate is required.

When controlling the pH value, if the pH value is too high, as described in Patent Document 2, there is a risk that salts generated during neutralization will stick and even CO ₂ will dissolve. For this reason, the amount of the neutralizing agent used for neutralizing the pH value must be increased.
As a result, there is a new problem that the cost for controlling the pH value when dumping the SOx-removed cleaning liquid into the sea, including the case of using seawater, increases.

On the other hand, when removing SOx in the exhaust gas by gas-liquid contact in the scrubber, it is necessary to remove it efficiently. Therefore, as described in Japanese Patent Application Laid-Open No. 2002-200010, it is also practiced to bring a washing liquid sprayed in mist form into contact with the swirling exhaust gas.
However, although the cleaning liquid is sprayed by the injection nozzle, if sufficient contact time and contact area between the sprayed cleaning liquid and the exhaust gas are not ensured, there is a risk that the cleaning liquid may not sufficiently capture SOx. The reason for this is that, as disclosed in Patent Document 3, the residence time of the cleaning liquid differs depending on the spray angle.

JP 2011-157959 A Japanese Patent No. 5940727 Japanese Patent No. 5998915

SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas purifying system capable of purifying the exhaust gas by efficiently removing harmful components from the exhaust gas without increasing costs. In particular, the object is to provide a configuration capable of removing harmful components in exhaust gas without requiring a complicated structure or large-scale equipment.

In order to solve this problem, the present invention provides an exhaust gas purification system for removing harmful components in exhaust gas by contact with a cleaning liquid, in which the cleaning liquid is sprayed, becomes mist, and diffuses into the exhaust gas. A gas-liquid contacting portion having a gas-liquid contacting space inside, and the cleaning liquid supplied to the gas-liquid contacting portion are prepared for the injection in a state of fine particles before being sprayed. and a cleaning liquid supply unit .

According to the present invention, the cleaning liquid, which normally becomes fine particles by injection from the injection position, is finely atomized before being injected. The diffusibility of the cleaning liquid is enhanced at the contact portion.
As a result, the contact area and contact time with the exhaust gas are increased by simply changing the form of the cleaning liquid itself, without adding any special changes to the structure of the gas-liquid contact part. Increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram for demonstrating the exhaust-gas purification system concerning embodiment of this invention. FIG. 2 is a schematic diagram for explaining a configuration around a gas-liquid contact portion, which is one component used in the exhaust gas purification system shown in FIG. 1; 3 is a schematic diagram for explaining the configuration of a cleaning liquid supply unit for the gas-liquid contact unit shown in FIG. 2. FIG. 4 is a block diagram for explaining the configuration of a control unit used in the cleaning liquid supply unit shown in FIG. 3; FIG. FIG. 5 is a flowchart for explaining one of the actions performed by the control unit shown in FIG. 4; FIG. FIG. 5 is a flowchart for explaining another action performed by the control unit shown in FIG. 4; FIG.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated. In the embodiment described below, SOx, which is one of the harmful components in the exhaust gas, is targeted for collection, but NOx, which is one of the harmful components other than this, can also be targeted for collection. is.
In FIG. 1, an exhaust gas purification system 1 according to an embodiment of the present invention is provided as an accessory facility of an engine 3 arranged in an engine room provided in a hull 2. As shown in FIG.
The exhaust gas purification system 1 includes a gas-liquid contact section 4 that brings the exhaust gas into contact with a cleaning liquid, and a cleaning liquid supply section 5 that supplies seawater, which is one of the cleaning liquids, to the gas-liquid contact section 4 .

As shown in FIG. 2, the gas-liquid contact portion 4 is a wet type gas-liquid contacting portion 4 having an exhaust pipe 4A communicating with an exhaust port of the engine 3 connected at the bottom and an exhaust port 4B for discharging the purified gas at the top. A scrubber is used.
The gas-liquid contact portion 4 is provided with an injection nozzle 6 that injects cleaning liquid in a direction opposite to the flow direction of the exhaust gas between an exhaust pipe 4A and an exhaust port 4B provided in the internal space.
The injection nozzle 6 is positioned at the end of a pipe 6A connected to the cleaning liquid supply unit 5, which will be described later, and has an on-off valve LV1 arranged in the middle of the pipe 6A.
The on-off valve LV1 is a member whose opening/closing number and opening/closing amount are selected according to the amount and temperature of the exhaust gas.

A collecting member 7 is arranged behind the injection nozzle 6 in the flow direction of the exhaust gas.
As the collecting member 7, a honeycomb structure having through-holes through which the cleaning liquid and the exhaust gas can come into contact is used. The collecting member 7 can collect the SOx, which is one of harmful components in the exhaust gas that has turned into a mist due to contact with the cleaning liquid, by adhering it to the wall surface of the through hole.

In the space below the gas-liquid contact portion 4, a cleaning liquid storage portion 4C is provided below the exhaust pipe 4A. The cleaning liquid dropped from the collection member 7 and stored in the cleaning liquid storage section 4C can be drawn out toward the processing device 8 .
The processing device 8 is provided for correcting the pH value of the cleaning liquid to a value corresponding to the neutralized state by introducing a neutralizing agent into the cleaning liquid having strong acidity after the SOx is collected.
The cleaning liquid whose pH value has been corrected to a neutral state in the processing device 8 is either discharged into the sea and discarded, or circulated to the cleaning liquid supply unit 5 again.

A conduit P1 is provided for circulating the cleaning liquid toward the cleaning liquid supply section 5 and for taking in seawater toward the cleaning liquid supply section 5 .
One end in the extension direction of the pipeline P<b>1 communicates with an opening (not shown) formed in the hull 2 , and the other end in the extension direction is connected to the cleaning liquid supply unit 5 .
A circulation path P2 extending from the processing device 8 is connected between one end and the other end in the extension direction of the pipeline P1. An on-off valve LV2 that is closed when the cleaning liquid is discarded from the treatment device 8 toward the sea is arranged in the pipeline P1 to which the circulation path P2 is connected.

A pump 9 and a directional switching valve 10 that can rotate forward and backward are arranged in the pipeline P1 at a position closer to the seawater intake side than the connection position with the circulation channel P2.
The pump 9 is rotatable in a direction that allows intake of sea water and disposal of washing liquid into the sea water.
The directional switching valve 10 is provided to set the circulation state of the seawater and the cleaning liquid when seawater is taken in, when the washed cleaning liquid is discarded into the sea, or when the cleaning liquid is circulated toward the cleaning liquid supply section 5. .

The gas-liquid contact portion 4 is a portion where the exhaust gas is brought into contact with the cleaning liquid injected from the injection nozzle 6 to turn the SOx in the exhaust gas into mist.
The exhaust gas that has come into contact with the cleaning liquid collects SOx that has become a mist when passing through the collecting member 7 . As a result, the exhaust gas that has passed through the collecting member 7 is exhausted from the exhaust port 4B in a purified state by removing SOx.

On the other hand, the mist-like SOx collected by the collecting member 7 and the cleaning liquid adhering to the collecting member 7 are accumulated in the cleaning liquid reservoir 4</b>C of the gas-liquid contact portion 4 by dropping.
When the cleaning liquid stored in the cleaning liquid storage section 4C reaches a predetermined amount, it is sent toward the processing device 8, and treated by adding a neutralizing agent or the like to render it harmless. The detoxified cleansing liquid may be circulated again toward the cleansing liquid supply unit 5 by switching the flow path of the pump 9 and the directional switching valve 10, or may be discarded toward the sea. selected.

The cleaning liquid is supplied from the cleaning liquid supply section 5 to the gas-liquid contact section 4 having the above configuration.
The cleaning liquid supply unit 5 is a feature of this embodiment.
The function of the cleaning liquid supply unit 5 is to prepare the cleaning liquid for injection in a finely divided state, separate from the mist obtained by being injected by the injection nozzle 6, before being injected by the injection nozzle 6. .
This configuration will be described below.
3A and 3B are schematic diagrams showing the configuration of the cleaning liquid supply unit 5, and the configurations shown in FIGS. 3A and 3B are different in the fine graining mechanism.

The cleaning liquid supply unit 5 mainly includes fine particle generation units 5A and 5A1 and a temperature control unit 5B.
A honeycomb structure is used for the fine particle generating portion 5A shown in FIG. 3(A). A plurality of honeycomb structures are laminated, and the through holes of the honeycomb structures are partially communicated with each other and overlapped. This structure causes the cleaning liquid to split due to the frictional force generated when the cleaning liquid passes through the communicating portions of the through holes.
The cleaning liquid changes from the original liquid film size to a mist of a finer size by splitting.
As another example of the method of splitting the cleaning liquid using frictional force, there is a method of flowing the cleaning liquid in a curved path at high speed. According to this method, the frictional force generated when the cleaning liquid collides with the inner surface of the curved path can be used to shear and split the cleaning liquid, thereby making it finer.

The fine particle generator 5A1 shown in FIG. 3(B) uses an oscillating section that finely particles by vibrating the cleaning liquid to make it into a pulverized state.
The fine particle generators 5A and 5A1 described above are not limited to pulverization, fragmentation, and splitting due to the frictional force and vibration generated when the cleaning liquid flows, but also pulverization of the cleaning liquid by the energy of the airflow when the airflow is applied. etc. are also used. In addition, it employs a configuration that pulverizes the cleaning liquid by the pressure when the cleaning liquid collides with each other in the fine particle generation unit, a configuration that uses centrifugal force to break up the cleaning liquid, and a configuration that uses the roughness of the filter that allows the cleaning liquid to pass through. It is also possible to
A method of vibrating and clustering the molecules of the cleaning liquid can be used to make the cleaning liquid finer. In this method, a coil that applies high-frequency vibration from the outside of the piping through which the cleaning liquid flows is arranged, and the size can be divided according to the set frequency.

The cleaning liquid finely divided in the fine particle generators 5A and 5A1 is formed into mist having a size capable of capturing SOx, which is a harmful component contained in the exhaust gas, when sprayed from the spray nozzle. Specifically, based on the molecular size of the SOx to be captured, it is desirable to prepare a size capable of capturing a plurality of SOx at the time of injection from the injection nozzle 6 .

The cleaning liquid passing through the fine particle generators 5A and 5A1 may be subject to temperature control when being misted.
Temperature control of the cleaning liquid is to achieve the following objectives.
The first purpose is to prevent the mist size of the cleaning liquid from changing from the initial size due to the heat from the exhaust gas.
The second purpose is to enable capture of altered harmful components based on the dew point at which the harmful components of the exhaust gas are altered.

The first purpose is set based on the following reasons.
The cleaning liquid changes its mist state due to the heat of the exhaust gas coming into contact with it. In particular, when it comes into contact with the exhaust gas, it receives heat from the exhaust gas and increases the heat of vaporization. As a result, when part of the cleaning liquid evaporates, the size of the mist formed in the fine particle generators 5A and 5A1 may change and become smaller than the initial size. As a result, there is a possibility that it will not be possible to maintain a size sufficient to trap SOx in the exhaust gas.
Therefore, in the present embodiment, attention is paid to giving the cleaning liquid a temperature at which it is possible to suppress the mist of the cleaning liquid from increasing the evaporation heat due to the heat of the exhaust gas when it comes into contact with the exhaust gas.

The second purpose is set based on the following reasons.
If the temperature of the exhaust gas itself suddenly changes, the harmful components contained in the exhaust gas may change, and the changed components may cause new problems. The new problem in this case is that the metal is corroded by harmful components generated when the temperature of the exhaust gas drops sharply.

A little more explanation about the deterioration of harmful ingredients is as follows.
SOx contained in the exhaust gas is often mainly _SO2 , but it is known that a part of SOx is oxidized and changed to _SO3 . This _SO3 reacts with moisture in the exhaust gas to become sulfuric acid. Sulfuric acid mists when the temperature of the exhaust gas drops below the dew point and changes into sulfuric acid mist. Sulfuric acid mist is known to be a component that is extremely small in size and has the problem of corroding metals.

Since the sulfuric acid mist has a small diameter and moves at a low speed, the probability of collision with the cleaning liquid mist is low. Therefore, it is known that the efficiency of capturing the sulfuric acid mist is deteriorated.
For this reason, it is desired that the particle size of the sulfuric acid mist be maintained at a size that allows it to be easily captured by the mist of the cleaning liquid.
Therefore, in the present embodiment, attention is paid to maintaining a size that facilitates capture of the sulfuric acid mist in the exhaust gas that deteriorates due to a decrease in the temperature of the exhaust gas.

For the above reason, the heating source and cooling source denoted by reference numerals 103 and 104 in FIG. 3 are used as members used in the temperature control section 5B for controlling the temperature of the cleaning liquid.
The heating source 103 and the cooling source 104 are provided in a position switching member C having chambers C1 to C3 whose communication state with respect to the pipe line P1 is switched inside the cleaning liquid supply unit 5 .
The position switching member C is provided with an auxiliary conduit P1A that can communicate with the conduit P1 in each of the chambers C1 to C3.

When the chamber moves to the neutral position indicated by symbol C3 (the position indicated by symbol (N) in FIG. 2), the auxiliary pipeline P1A transfers the seawater toward the pipeline P1 at the same temperature as when it was taken in. be able to.
Among the auxiliary pipes P1A, the auxiliary pipe P1A provided in the heat source 103 is used to transfer seawater heated by the heating medium passage HR arranged in the chamber C1 to the pipe P1A. used to transport to
Among the auxiliary pipes P1A, the auxiliary pipe P1A provided in the cooling source 104 supplies the seawater, which has been lowered in temperature by being cooled by the cooling medium passage CR arranged in the chamber C2, to the pipe P1. It is used for direct transport.

As for the heat source 103, a heat pipe utilizing the temperature of the exhaust gas is used in the heating medium passage HR. The heat pipe surrounds the auxiliary conduit P1A within the chamber C1 in which the auxiliary conduit P1A is arranged and which is communicable with the conduit P1.
As for the cooling source 104, a cooling pipe communicating with a cooling device (not shown) is used in the cooling medium passage CR. A cooling pipe surrounds the auxiliary conduit P1A within the chamber C2 in which the auxiliary conduit P1A is located.
The position switching member C switches the state of communication between the auxiliary conduit P1A and the conduit P1 of each chamber by the controller 100 shown in FIG.

The control unit 100 is provided for determining the injection amount of the cleaning liquid mist according to the flow rate of the exhaust gas, and for controlling the driving of the members used to achieve the first and second objects. ing.
When the exhaust gas flow rate, the exhaust gas temperature, and the cleaning liquid temperature are input, the control unit 100 executes the drive conditions of the pump 9, the position switching setting of the directional switching valve 10, and the drive control of the heating source 103 or the cooling source 104. .

In FIG. 4, an exhaust gas flow meter 101, an exhaust gas thermometer LT, and a cleaning fluid thermometer 102 are connected to the input side of a control unit 100, and a pump 9, a direction switching valve 10, a heating source 103, a cooling A source 104 is connected.
On the output side of the control unit 100, in addition to the devices described above, an on-off valve LV1 with a variable flow rate that is controlled to determine the amount of cleaning liquid to be sprayed to the injection nozzle 6, a processing device 8, and a cleaning liquid supply section 5 are provided. The on-off valves LV2 arranged in the connecting pipelines P1 are connected respectively.

The opening/closing valve LV1 is controlled to open/close in order to set the amount of cleaning liquid to be injected according to the amount of exhaust gas by the number of injection nozzles 6 for injection and the degree of opening/closing.
The on-off valve LV2 is opened when the cleaning liquid that has been cleaned is circulated from the processing device 8 toward the pipeline P1.
In FIG. 4, the arrow displayed on the output side of the control unit 100 indicates the direction of the output signal, and the arrow displayed on the input side of the control unit 100 (with arrows on both sides) Denotes the direction of the signal for feedback processing.

As a result of detecting the temperature of the exhaust gas and the temperature of the cleaning liquid, the control section 100 determines that the temperature does not require temperature control of the cleaning liquid. executed. At this time, the control unit 100 sets the chamber of the position switching unit C provided in the direction switching valve 10 to the neutral position (the neutral position indicated by symbol C3 in FIG. 3).

The control unit 100 uses the temperature difference between the exhaust gas temperature and the cleaning liquid temperature during temperature control for achieving the first purpose.
The temperature difference is used as an indicator of whether the cleaning liquid mist size changes from its original size. That is, when the heat of the exhaust gas increases the evaporation heat of the cleaning liquid, the size of the mist of the cleaning liquid tends to change from the initial size.
In the control unit 100, the temperature difference is compared with a predetermined value (K1), and when the temperature difference is equal to or greater than the predetermined value (K1), it is determined that the evaporation heat of the cleaning liquid is increasing due to the heat of the exhaust gas. . When this determination is made, the temperature of the cleaning liquid is raised to reduce the temperature difference. As a result, the temperature gradient between the two, which is obtained by the amount of heat transferred from the exhaust gas to the cleaning liquid due to the temperature difference, is also reduced.

The control unit 100 uses the result of comparison between the exhaust gas temperature and the dew point during temperature control for achieving the second purpose.
The dew point is the temperature at which _SO3 in the exhaust gas mists and transforms into sulfuric acid mist.
If the result of detecting the temperature of the exhaust gas is the temperature (dew point) at which _SO3 in the exhaust gas transforms into sulfuric acid mist or higher, the control unit 100 adjusts the temperature to a temperature at which _SO3 in the exhaust gas turns into mist. and maintain the size of the sulfuric acid mist at a size that can be captured by the mist of the cleaning solution.
Specifically, the temperature of the exhaust gas is set to a temperature below the dew point to generate sulfuric acid mist. adjust the temperature of

The operation of the exhaust gas purification system having the above configuration will be described below with reference to the flowchart of FIG. 5 showing the operation of the control unit 100.
The control unit 100 takes in each data of the exhaust gas flow rate, the exhaust gas temperature, and the cleaning liquid temperature (ST1).
Using the acquired data, the exhaust gas flow rate is determined, and opening/closing control of the on-off valve LV1 communicating with the injection nozzle 6 is executed so that the spray amount of the cleaning liquid corresponding to the exhaust gas flow rate is obtained (ST2).
When the open/close valve LV1 is controlled to open/close, the controller 100 determines the temperature difference between the temperature of the exhaust gas and the temperature of the cleaning liquid (ST3).

When the mist finely divided in the cleaning liquid supply unit 5 before being sprayed is sprayed from the spray nozzle 6, mist with a size smaller than the mist size of the spray nozzle 6 alone diffuses into the gas-liquid contact space. .
In the gas-liquid contact space, finely divided cleaning liquid mist exists with an increased diffusivity, so a large amount of cleaning liquid mist comes into contact with the exhaust gas. As a result, the contact area and contact time of the cleaning mist with the exhaust gas are increased, and the efficiency of removing harmful components in the exhaust gas is enhanced.

In step ST3, if the temperature difference is equal to or greater than the predetermined value (K1), processing is executed to achieve the first object.
In FIG. 5, when the temperature difference is equal to or greater than a predetermined value (K1), the position of the position switching member C of the cleaning liquid supply section 5 is switched to a state in which the cleaning liquid passes through the heat source 103 (ST4, 5).

When the chamber position of the position switching member C is switched to a state in which the cleaning liquid passes through the heat source 103, the temperature of the cleaning liquid is raised and the temperature difference between it and the temperature of the exhaust gas is reduced. As a result, it is possible to suppress an increase in evaporation heat due to the heat received by the cleaning gas from the exhaust gas, thereby suppressing changes in the cleaning liquid mist due to adverse effects such as foaming and bubble breaking.

On the other hand, the processing for achieving the second purpose is shown in FIG.
In FIG. 6, the exhaust gas temperature is detected, and it is determined whether the temperature is above the dew point (ST3A).

When it is determined that the exhaust gas temperature is equal to or higher than the dew point, the position of the position switching member C of the cleaning liquid supply unit 5 is switched to a position where the auxiliary conduit P1A and the conduit P1 of the cooling source 104 communicate ( ST4A, ST5A).
When the chamber position of the position-switching member C is switched to pass the cleaning liquid through the cooling source 104, the cleaning liquid is cooled down to correct the temperature of the exhaust gas below the dew point. As a result, the sulfuric acid present in the exhaust gas is misted and transformed into sulfuric acid mist.

Sulfuric acid mist, which is made into a mist by degeneration of sulfuric acid that has changed from gaseous SO ₂ , tends to increase in size when the temperature is lowered by contact with the cleaning liquid mist. Thus, by setting the size of the sulfuric acid mist to a size suitable for the mist size of the cleaning liquid and maintaining that size, it is possible to secure the capture of the sulfuric acid mist.
In this state, the temperature adjustment is monitored by continuing the comparative determination of the exhaust gas temperature and the dew point (ST6A).

According to the above-described embodiment, it is possible to spray a mist smaller than the size of the cleaning liquid mist from the injection nozzle 6 only by adding a configuration in which the cleaning liquid is atomized before the injection nozzle 6 sprays. . As a result, the diffusibility of the cleaning liquid mist in the gas-liquid contact space is enhanced, and the contact area and contact time with the exhaust gas are increased. As a result, it becomes possible to improve the removal rate of harmful components in the exhaust gas.
On the other hand, the mist that is smaller than the mist size from the injection nozzle 6 alone is suppressed from increasing the heat of vaporization due to the heat received from the exhaust gas. does not change the
In addition, harmful components in the exhaust gas that have changed in quality due to changes in the temperature of the exhaust gas can also be easily captured by adjusting the temperature of the cleaning liquid, so that the efficiency of removing harmful components can be prevented from decreasing.

The present invention increases the diffusion rate in the gas-liquid contact space and increases the contact time and contact area with harmful ingredients by simply using a simple configuration of finely dividing the cleaning liquid before it is sprayed by the injection nozzle. It can be expected to increase the capture rate of the component.
Moreover, the mist of the cleaning liquid can be maintained at a predetermined size without using a new structure in the purification system, and the temperature change of the exhaust gas that comes into contact with this mist can be suppressed to prevent deterioration of the ability to capture harmful components. Highly available where possible.

1 exhaust gas purification system 4 gas-liquid contact part 5 cleaning liquid supply part 5A, 5A1 fine particle generation part 6 injection nozzle 100 control part 103 heating source 104 cooling source

Claims (5)

An exhaust gas purification system that removes harmful components in exhaust gas by contact with a cleaning liquid,
a gas-liquid contact portion having therein a gas-liquid contact space in which the cleaning liquid is sprayed, dispersed as mist, and contacts with the exhaust gas;
a cleaning liquid supply unit that prepares the cleaning liquid to be supplied to the gas-liquid contact part in a finely divided state for the injection before the cleaning liquid is injected ;
An exhaust gas purification system comprising : In the exhaust gas purification system according to claim 1,
The exhaust gas purification system, wherein the cleaning liquid is prepared for the injection by setting the size of the cleaning liquid so that the harmful component can be trapped at the time of the injection. In the exhaust gas purification system according to claim 1 or 2,
The exhaust gas purification system, wherein the cleaning liquid is maintained at a temperature at which harmful components contained in the exhaust gas can be turned into mist, and is prepared before injection. In the exhaust gas purification system according to claim 3,
The exhaust gas purification system, wherein the cleaning liquid is cooled or heated to a temperature at which the harmful component can be turned into a mist, and is prepared before injection. In the exhaust gas purification system according to one of claims 1 to 4,
The exhaust gas purification system, wherein the cleaning liquid is pulverized by friction or vibration in the flow path.

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